Genuine Bosch replacement switch/button (2 609 004 778 / 2609004778, also listed as 1600A007UL) — a black plastic on/off control knob designed for Bosch angle grinders and related PWS/PWR series machines.

Fits (examples) — commonly used on Bosch models such as PWS 750-115, PWS 850-125, PWS 1000-125 and several PWS Universal / PWR 180 CE variants (appears as position 23 in Bosch exploded parts diagrams for these types).

Simple direct-replacement design: snap-fit knob that mates with the tool’s existing switch mechanism for straightforward installation, restoring reliable start/stop control — a practical choice when you need a single genuine part to fix a faulty switch. This is listed among genuine Bosch power tool parts for the PWS/PWR.

Browse our full range of Bosch grinder parts.